Nikon FTZ for D lenses
Nov 21, 2021 11:12:32 #
User ID wrote:
Acoarst the in-body motor wasn’t built to drive a conventional unit focusing long heavy tele ... and neither was the EOS motor. Both methods, IOW use of AF in general, spelled the end for unit focusing.
IF designs were not unheard of but with AF, IF proliferated as a necessity filtering down even to smaller lenses. Today we expect to see no external motion when focusing (acoarst there’s always a few hold outs). IF helps with weather resistance as well.
IF designs were not unheard of but with AF, IF proliferated as a necessity filtering down even to smaller lenses. Today we expect to see no external motion when focusing (acoarst there’s always a few hold outs). IF helps with weather resistance as well.
A big lens which needs larger motor but also has more room to accommodate a large motor. Still the AF needs to be fast so IF and not well damped focusing were used to allow for fast AF. IF shorten the focal length at close focusing distance.
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